Talking-machine.



G. THIEL.

TALKING MACHINE. 7 APPLICATION TILED mums, 1911.

Patented Sept. 9,1913.

Wimesses.

Inventor z y m. ,3 w a e eusrav THIEL, or BERLIN,-GERMANY.

' annulus-MACHINE.

' Specification of Letters Patent,

Patented se t. s, 1913.

Application filed January 5, v1911.. Serial No. 600,865.

To all whom it may concern:

Be it known that I, GUs'rAv THIEL, a sub-' ject of the German Emperor, and a resident of Tilsiterstrasse 67,.Berlin, Germany, have invented a certain new and useful Improvement in or Relating to Talking-Machines; andl do hereby declare. the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawing, and to letters of reference marked thereon, which form a part of this specification.

This invention relates to talking machines.

The invention has particular reference to the connection of the sound box to the sound arm by eccentrically connecting the box to the sound. arm.

Heretofore, in order to permit-the sound box and needle to rise and fall to follow closely the record groove, it has been custernary, for instance, toeither pivotally connect the inner end of the sound arm to the horn, construct the sound arm of two lengths and, pivotally connect one to the other longitudinally, or, in some similar manner, provide for vertical movement ofthe sound box and needle together with a portion of or the whole of the sound arm, It is well known that in talking machines,

the interposition necessary in'the common forms of construction, of loose joints, curves,

or any other obstruction that breaks the desirable continuity of smooth surface of the sound arm between the sound box and the horn, injures thequality of the sound by breaking up the regular formation and transmission of the sound waves; such con struction also diminishes the force oft-he sound waves. There is also another serious objection to the common forms of construction above referred to, and that is, the weight of the sound arm which is carried by the needle, causes the needle, as it travels over the record groove, to produce the disk agreeable scratching sound which is so noticeable in. machines of this construction.

Consequently, it is desirable to effect a construction free, if possible, from the above defects, and I have succeeded in largely accomplishing this purpose by securing the sound box to the sound arm'in such manner, as by eccentrically mounting it thereon, that of'the sound box engages wit rotation of-the record. Owing to this'alrgroove, and also permitting the needle to adjust itself to any variation in the plane'of rangement, no separate link is required be M tween-the sound arm and the sound box or between two sections of the sound arm itself,

orbetwee'n the sound arm and the horn, thus providing a sound arm with a continuous smooth inner surface and therev fore free from the ObJGOlJlOIlS above referred to. Owing to the eccentric mounting, the sound box, under the action of its own weight, will be pressed against the record disk. The construction is carried out in practice in such manner that a branch is mounted on the sound box and introduced into the sound arm, so that p the sound box and branch can rotate on the soundarm., Th s construction 1s improved according to the present invention by arranging over the branch of the sound box a rotatable sleeve, for increasing the mobility of the sound box and for improving the tight joint for the' sound. The said branch is provided with a pin guided in'the slot of the sleeve. This sleeve is provided with a pin which is introduced into a slot of the sound arm.

In the'accompanying drawing Figure l'is a side elevation of the sound box with the sound arm in section, Fig. 2 is a section on the line 22, Fig. 1, througlr'the sound arm and the branch of the sound box, and Fig. 3 is a plan of a portion of the sound arm with the Slot. f i

The soundbbx is marked a, and the sound arm 5. Over the branch. 6 of the sound box is placed a sleeve a l provided with a pin 0 by means of which it engages with the slot 5 of the sound arm. A pin 9 on the branch 6 h a slot j of the sleeve d, so that the sound box' and branch can freely rotate in the sleeve a. What I claim is: 1. In a talking machine, the of a sound armfan eccentrically, positioned sound box therein having a neck, and a sleeve non-rotatably engaging said arm and rotatably engaging said neck.

combination- 2. In a talking machine, the combination pused m ck thereon providedevith a sleeve engaging member, a sleeve freely rotatable on said mck and provided with a slot to receive said member, a sound arm engaging member or, said sleeve and a sound arm slotted to receive said last named member and sleeve 1-0n-1'otatab1y therein.

- GUSTAV THIEL.

Witnesses HENRY HASPER, WOLDEMAR HAUPT. 

